@article{13360, author = {{Wiebeler, Christian and Plasser, Felix and Hedley, Gordon J. and Ruseckas, Arvydas and Samuel, Ifor D. W. and Schumacher, Stefan}}, issn = {{1948-7185}}, journal = {{The Journal of Physical Chemistry Letters}}, pages = {{1086--1092}}, title = {{{Ultrafast Electronic Energy Transfer in an Orthogonal Molecular Dyad}}}, doi = {{10.1021/acs.jpclett.7b00089}}, year = {{2017}}, } @article{3435, abstract = {{Semiconductor quantum dots are promising sources for polarization-entangled photons. As an alternative to the usual cascaded biexciton-exciton emission, direct two-photon emission from the biexciton can be used. With a high-quality optical resonator tuned to half the biexciton energy, a large proportion of the photons can be steered into the two-photon emission channel. In this case the degree of polarization entanglement is inherently insensitive to the exciton fine-structure splitting. In the present work we analyze the biexciton emission with particular emphasis on the influence of coupling of the quantum-dot cavity system to its environment. Especially for a high-quality cavity, the coupling to the surrounding semiconductormaterial can open up additional phonon-assisted decay channels. Our analysis demonstrates that with the cavity tuned to half the biexciton energy, the potentially detrimental influence of the phonons on the polarization entanglement is strongly suppressed—high degrees of entanglement can still be achieved. We further discuss spectral properties and statistics of the emitted twin photons.}}, author = {{Heinze, Dirk and Zrenner, Artur and Schumacher, Stefan}}, issn = {{1098-0121}}, journal = {{Physical Review B}}, number = {{24}}, title = {{{Polarization-entangled twin photons from two-photon quantum-dot emission}}}, doi = {{10.1103/PhysRevB.95.245306}}, year = {{2017}}, } @article{13359, author = {{Ma, Xuekai and Egorov, Oleg A. and Schumacher, Stefan}}, issn = {{0031-9007}}, journal = {{Physical Review Letters}}, number = {{15}}, title = {{{Creation and Manipulation of Stable Dark Solitons and Vortices in Microcavity Polariton Condensates}}}, doi = {{10.1103/physrevlett.118.157401}}, volume = {{118}}, year = {{2017}}, } @article{13358, author = {{Vollbrecht, Joachim and Wiebeler, Christian and Schumacher, Stefan and Bock, Harald and Kitzerow, Heinz-Siegfried}}, issn = {{1542-1406}}, journal = {{Molecular Crystals and Liquid Crystals}}, pages = {{66--73}}, title = {{{Enhanced columnar mesophase range through distortions in arene cores}}}, doi = {{10.1080/15421406.2017.1284387}}, year = {{2017}}, } @article{13361, author = {{Lafont, O. and Luk, S. M. H. and Lewandowski, P. and Kwong, N. H. and Leung, P. T. and Galopin, E. and Lemaitre, A. and Tignon, J. and Schumacher, Stefan and Baudin, E. and Binder, R.}}, issn = {{0003-6951}}, journal = {{Applied Physics Letters}}, title = {{{Controlling the optical spin Hall effect with light}}}, doi = {{10.1063/1.4975681}}, year = {{2017}}, } @article{13356, author = {{Ma, Xuekai and Schumacher, Stefan}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{23}}, title = {{{Vortex-vortex control in exciton-polariton condensates}}}, doi = {{10.1103/physrevb.95.235301}}, volume = {{95}}, year = {{2017}}, } @article{19210, author = {{Breddermann, D. and Heinze, Dirk Florian and Binder, R. and Zrenner, Artur and Schumacher, Stefan}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, title = {{{All-optical tailoring of single-photon spectra in a quantum-dot microcavity system}}}, doi = {{10.1103/physrevb.94.165310}}, year = {{2016}}, } @article{13910, author = {{Ma, Xuekai and Driben, Rodislav and Malomed, Boris A. and Meier, Torsten and Schumacher, Stefan}}, issn = {{2045-2322}}, journal = {{Scientific Reports}}, title = {{{Two-dimensional symbiotic solitons and vortices in binary condensates with attractive cross-species interaction}}}, doi = {{10.1038/srep34847}}, volume = {{6}}, year = {{2016}}, } @article{4185, abstract = {{Semiconductor quantum-dot cavity systems are promising sources for solid-state-based on-demand generation of single photons for quantum communication. Commonly, the spectral characteristics of the emitted single photon are fixed by system properties such as electronic transition energies and spectral properties of the cavity. In the present work we study cavity-enhanced single-photon generation from the quantum-dot biexciton through a partly stimulated nondegenerate two-photon emission. We show that frequency and linewidth of the single photon can be fully controlled by the stimulating laser pulse, ultimately allowing for efficient all-optical spectral shaping of the single photon.}}, author = {{Breddermann, D. and Heinze, D. and Binder, R. and Zrenner, Artur and Schumacher, Stefan}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, number = {{16}}, publisher = {{American Physical Society (APS)}}, title = {{{All-optical tailoring of single-photon spectra in a quantum-dot microcavity system}}}, doi = {{10.1103/physrevb.94.165310}}, volume = {{94}}, year = {{2016}}, } @article{15854, author = {{Lewandowski, Przemyslaw and Lafont, Ombline and Baudin, Emmanuel and Chan, Chris K. P. and Leung, P. T. and Luk, Samuel M. H. and Galopin, Elisabeth and Lemaître, Aristide and Bloch, Jacqueline and Tignon, Jerome and Roussignol, Philippe and Kwong, N. H. and Binder, Rolf and Schumacher, Stefan}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, title = {{{Polarization dependence of nonlinear wave mixing of spinor polaritons in semiconductor microcavities}}}, doi = {{10.1103/physrevb.94.045308}}, year = {{2016}}, } @article{15852, author = {{Niemietz, Dominik and Schmutzler, Johannes and Lewandowski, Przemyslaw and Winkler, Karol and Aßmann, Marc and Schumacher, Stefan and Brodbeck, Sebastian and Kamp, Martin and Schneider, Christian and Höfling, Sven and Bayer, Manfred}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, title = {{{Experimental realization of a polariton beam amplifier}}}, doi = {{10.1103/physrevb.93.235301}}, year = {{2016}}, } @article{15853, author = {{Yulin, A. V. and Chestnov, I. Yu. and Ma, X. and Schumacher, Stefan and Peschel, U. and Egorov, O. A.}}, issn = {{2469-9950}}, journal = {{Physical Review B}}, title = {{{Dynamics of exciton-polaritons in discrete lattices under incoherent localized pumping}}}, doi = {{10.1103/physrevb.94.054312}}, year = {{2016}}, } @article{15856, author = {{Vollbrecht, Joachim and Wiebeler, Christian and Neuba, Adam and Bock, Harald and Schumacher, Stefan and Kitzerow, Heinz-Siegfried}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, pages = {{7839--7848}}, title = {{{Bay-Extended, Distorted Perylene Esters Showing Visible Luminescence after Ultraviolet Excitation: Photophysical and Electrochemical Analysis}}}, doi = {{10.1021/acs.jpcc.6b00954}}, year = {{2016}}, } @article{15855, author = {{Kwong, N. H. and Tsang, C. Y. and Luk, M. H. and Tse, Y. C. and Lewandowski, P. and Chan, Chris K. P. and Leung, P. T. and Schumacher, Stefan and Binder, R.}}, issn = {{0740-3224}}, journal = {{Journal of the Optical Society of America B}}, title = {{{Patterns and switching dynamics in polaritonic quantum fluids in semiconductor microcavities [Invited]}}}, doi = {{10.1364/josab.33.00c153}}, year = {{2016}}, } @article{19209, author = {{Heinze, Dirk Florian and Breddermann, Dominik and Zrenner, Artur and Schumacher, Stefan}}, issn = {{2041-1723}}, journal = {{Nature Communications}}, title = {{{A quantum dot single-photon source with on-the-fly all-optical polarization control and timed emission}}}, doi = {{10.1038/ncomms9473}}, year = {{2015}}, } @article{4330, abstract = {{Sources of single photons are key elements for applications in quantum information science. Among the different sources available, semiconductor quantum dots excel with their integrability in semiconductor on-chip solutions and the potential that photon emission can be triggered on demand. Usually, the photon is emitted from a single-exciton ground state. Polarization of the photon and time of emission are either probabilistic or pre-determined by electronic properties of the system. Here, we study the direct two-photon emission from the biexciton. The two-photon emission is enabled by a laser pulse driving the system into a virtual state inside the band gap. From this intermediate state, the single photon of interest is then spontaneously emitted. We show that emission through this higher-order transition provides a versatile approach to generate a single photon. Through the driving laser pulse, polarization state, frequency and emission time of the photon can be controlled on-the-fly.}}, author = {{Heinze, Dirk and Breddermann, Dominik and Zrenner, Artur and Schumacher, Stefan}}, issn = {{2041-1723}}, journal = {{Nature Communications}}, number = {{1}}, publisher = {{Springer Nature}}, title = {{{A quantum dot single-photon source with on-the-fly all-optical polarization control and timed emission}}}, doi = {{10.1038/ncomms9473}}, volume = {{6}}, year = {{2015}}, } @article{22946, abstract = {{The Kane–Mele model was previously used to describe effective spin–orbit couplings (SOCs) in graphene. Here we extend this model and also incorporate curvature effects to analyze the combined influence of SOC and curvature on the band structure of carbon nanotubes (CNTs). The extended model then reproduces the chirality-dependent asymmetric electron-hole splitting for semiconducting CNTs and in the band structure for metallic CNTs shows an opening of the band gap and a change of the Fermi wave vector with spin. For chiral semiconducting CNTs with large chiral angle we show that the spin-splitting configuration of bands near the Fermi energy depends on the value of $\text{mod}(2n+m,3)$ .}}, author = {{Liu, Hong and Heinze, Dirk Florian and Thanh Duc, Huynh and Schumacher, Stefan and Meier, Torsten}}, issn = {{0953-8984}}, journal = {{Journal of Physics: Condensed Matter}}, number = {{44}}, title = {{{Curvature effects in the band structure of carbon nanotubes including spin–orbit coupling}}}, doi = {{10.1088/0953-8984/27/44/445501}}, volume = {{27}}, year = {{2015}}, } @article{13922, author = {{Liu, Hong and Heinze, Dirk Florian and Thanh Duc, Huynh and Schumacher, Stefan and Meier, Torsten}}, issn = {{0953-8984}}, journal = {{Journal of Physics: Condensed Matter}}, number = {{44}}, title = {{{Curvature effects in the band structure of carbon nanotubes including spin–orbit coupling}}}, doi = {{10.1088/0953-8984/27/44/445501}}, volume = {{27}}, year = {{2015}}, } @article{15860, author = {{Denis, Jean-Christophe and Schumacher, Stefan and Hedley, Gordon J. and Ruseckas, Arvydas and Morawska, Paulina O. and Wang, Yue and Allard, Sybille and Scherf, Ullrich and Turnbull, Graham A. and Samuel, Ifor D. W. and Galbraith, Ian}}, issn = {{1932-7447}}, journal = {{The Journal of Physical Chemistry C}}, pages = {{9734--9744}}, title = {{{Subpicosecond Exciton Dynamics in Polyfluorene Films from Experiment and Microscopic Theory}}}, doi = {{10.1021/acs.jpcc.5b00680}}, year = {{2015}}, } @article{15858, author = {{Tse, Y C and Chan, Chris K P and Luk, M H and Kwong, N H and Leung, P T and Binder, R and Schumacher, Stefan}}, issn = {{1367-2630}}, journal = {{New Journal of Physics}}, title = {{{A population-competition model for analyzing transverse optical patterns including optical control and structural anisotropy}}}, doi = {{10.1088/1367-2630/17/8/083054}}, year = {{2015}}, }